257422745 has 16 divisors (see below), whose sum is σ = 314979840. Its totient is φ = 201912000.

The previous prime is 257422679. The next prime is 257422751. The reversal of 257422745 is 547224752.

It is a happy number.

It is not a de Polignac number, because 257422745 - 2¹⁰ = 257421721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 257422699 and 257422708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108320 + ... + 110670.

It is an arithmetic number, because the mean of its divisors is an integer number (19686240).

Almost surely, 2^257422745 is an apocalyptic number.

It is an amenable number.

257422745 is a deficient number, since it is larger than the sum of its proper divisors (57557095).

257422745 is a wasteful number, since it uses less digits than its factorization.

257422745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776.

The product of its digits is 156800, while the sum is 38.

The square root of 257422745 is about 16044.3991785296. The cubic root of 257422745 is about 636.1345332334.

The spelling of 257422745 in words is "two hundred fifty-seven million, four hundred twenty-two thousand, seven hundred forty-five".